Inflammatory symptoms of Cryopyrin-Associated Periodic Syndrome (CAPS) are due to mutations in a the NLRP-3 gene (previously known as Cold Induced Autoinflammatory Syndrome-1 or CIAS1). These mutations result in the body's overproduction of interleukin-1 (IL-1), a protein that stimulates the inflammatory process. IL-1 Trap (rilonacept) was designed to bind to the interleukin-1 cytokine and prevent it from binding to its receptors in the body.

The mean Key Symptom Score (KSS --from the validated, patient-administered Daily Health Assessment Form(DHAF)) was the average on a 0-10 scale (0=None, 10=Very Severe) of 5 separate scales -- rash, feeling of fever/chills, joint pain, eye redness/pain, and fatigue). KSS was averaged over two 21-day daily reporting periods (the 3 weeks prior to both baseline and week 6). In part A, a negative change in mean values indicated improvement under treatment with rilonacept in symptoms.

The DHAF was used because it is a validated instrument to collect subject's self-reported responses.

Subjects all received rilonacept 160 mg from week 6 through week 14. At week 15, subjects were re-randomized in a 1:1 ratio between Placebo and rilonacept 160 mg. Subjects baseline period was the 21-day period prior to week 15 randomization.

Some subjects were treated with Placebo in the Study. This occurred (if subject randomized to Placebo) either during the first 6 weeks of the study or during the randomized withdrawal (weeks 15-24).

Drug: Placebo

Subcutaneous injection of Placebo occurred during first 6 weeks of the study or during randomized withdrawal (weeks 15-24). On Day 1, subjects received two placebo injections.

Active Comparator: rilonacept 160 mg

If randomized to rilonacept, subjects received this treatment during the first 6 weeks of the study or during the randomized withdrawal (weeks 15-24). All subjects received rilonacept 160 mg during weeks 6-14 (between Parts A and B).

Study drug is administered as a 2.0 mL subcutaneous injection once a week. At baseline (week 0) subjects receive a loading dose of rilonacept 320 mg.

Drug: rilonacept 160 mg

Rilonacept was given by subcutaneous injection. It was administered weekly at the dose of 160mg. On Day 1, subjects received two injections of rilonacept (for a total of 320 mg).

Other Name: Rilonacept

Open-Label rilonacept 160 mg

After week 24 (the end of part B), all subjects went into weekly dosing of open label rilonacept 160 mg. During this phase of the study, adolescents aged 7 and above were entered into the study and rilonacept was dosed as 2.2 mg/kg injections, up to 160 mg, per week.

Study drug is administered as a 2.0 mL subcutaneous injection once a week.

Drug: rilonacept 160 mg

Rilonacept was given by subcutaneous injection. It was administered weekly at the dose of 160mg. No loading dose was given for subjects who entered directly into the open-label.

Detailed Description:

Primary Objective:

The primary objective of this study was to assess the effect of rilonacept on the clinical signs and symptoms of Cryopyrin-Associated Periodic Syndrome (CAPS) when used for chronic therapy as evaluated by the subjects themselves over time using a validated patient-reported outcomes tool.

Secondary Objective(s):

The secondary objectives were as follows:

To determine the safety and tolerability of rilonacept in subjects with CAPS

To assess the effect of rilonacept on laboratory measures of inflammation such as acute phase reactants

This was a multi-center, two-part, double-blind, placebo-controlled study (Parts A and B) designed to assess the efficacy, safety, and tolerability of weekly subcutaneous (SC) doses of 160 mg of rilonacept in adult subjects with active CAPS. These phases were followed by extended open-label phases. After written informed consent was obtained, subjects who met the protocol eligibility criteria were enrolled at one of 27 study sites in the United States. The study consisted of a 3-week screening period preceding Part A, a 6-week long double-blind, randomized phase of the study. All subjects were then treated with single-blind rilonacept for 9-weeks, followed by a subsequent 9-week, double-blind, withdrawal phase during which subjects were re-randomized to either rilonacept or placebo. Subjects then continued treatment in a 24-week open-label extension phase (OLE) and a further 112-week long-term open-label extension (LTOLE), during which all subjects received rilonacept and a 6-week post-treatment follow-up period. Amendments 4 and 6 allowed eligible adult and pediatric subjects aged 7 and above to enroll directly into the open-label phases of the trial.

For reporting purposes, the 24-week OLE and the 112-week LTOLE was considered one Open Label Extension (OLE) phase. This occurred after the 24-week double blind (Parts A and B ) phase. In other words, OLE Week 1 corresponded to the week 25 in the study.

OLE Week 72 was the final timepoint where efficacy was measured. Safety continued after that timepoint until the end of the study.

Eligibility

Ages Eligible for Study:

7 Years and older (Child, Adult, Senior)

Genders Eligible for Study:

Both

Accepts Healthy Volunteers:

No

Criteria

Inclusion Criteria:

Double-blind phases: adults age 18 and above; Open-label extension: Adults and children aged 7 years and older.

Was diagnosed with Familial Cold Auto-inflammatory Syndrome (FCAS) or Muckle-Wells Syndrome (MWS) based upon clinical signs and symptoms

Had documented mutation in NLRP-3 (Cold Induced Autoinflammatory Syndrome-1 or CIAS1) in subject or relative, and willingness to have a confirmatory genetic (Deoxyribonucleic acid or DNA) test (cheek swab).

Was able to understand and comply with study procedures and was able to provide informed consent

If female, was not currently pregnant and was willing to use contraception during the study

Exclusion Criteria:

Had evidence of untreated tuberculosis or other conditions/therapies that made the subject inappropriate for this study.

Contacts and Locations

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To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below.
For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT00288704